Crown caps for drug containers

Abstract

A rubber gasket is closely sealed by integrally connecting a removable close-fastening ring to a top board of a crown-like member to be fitted to a mouth portion in which a liquid drug is kept and pulling down the close-fastening ring to cover the outer periphery of the crown-like member.

What is claimed is: 
     
       1. A crown cap which comprises a close-fastening ring integrally separably formed on an upper portion of a crown/member comprising a cylindrical body which is fitted to a mouth portion of a container while surrounding a periphery of the mouth portion and having a diameter slightly greater than that of the crown/member and which is used in such a manner that a close-fastening ring is detached from the crown/member and put on an outer periphery of the crown/member by pressing the ring towards a side of the crown/member to thus closely fit the crown/member to the mouth portion of the container, wherein an opening is preliminarily formed through a top board of the crown/member, a removable closing body is fitted to the opening, the opening is exposed on the top board of the crown/member by disconnecting the closing body, and a plurality of projections for welding are formed on a lower surface of the closing body and the closing body is welded, through the projections, to the board of the crown/member at a strength ranging from 0.5 to 3 kgf as expressed in terms of an overall tensile strength.   
     
     
       2. The crown cap of claim 1 wherein the closing body comprises an elongated rod-shaped body which is removably fitted to an inner wall of the opening and stands up from the opening. 
     
     
       3. The crown cap of claim 1 wherein the closing body comprises a flat portion which is supported by and fitted to the opening and a finger-hook ring which can be pulled to remove the closing body. 
     
     
       4. The crown cap of claim 1 wherein an overall basal area of the plurality of projections for welding ranges from 0.4 to 2 mm 2 . 
     
     
       5. The crown cap of claim 1 wherein the closing body, the crown/member, and the close-fastening ring are formed from a thermoplastic resin. 
     
     
       6. The crown cap of claim 1 wherein the closing body, the crown/member, and the close-fastening ring are formed from at least one resin selected from polycarbonates, polyethylene terephthalates, and polybutylene terephthalates. 
     
     
       7. A crown cap which comprises a close-fastening ring integrally separably formed on an upper portion of a crown/member which is fitted to a mouth portion of a container while surrounding a periphery of the mouth portion and having a diameter slightly greater than that of the crown/member and which is used in such a manner that the close-fastening ring is detached from the crown/member and put on an outer periphery of the crown/member by pressing the ring towards a side of the crown/member to thus closely fit the crown/member to the mouth portion of the container, wherein a rubber gasket seals an opening of the mouth portion;   fixing means are disposed between the crown/member and the rubber gasket for preventing separation of the rubber gasket from the mouth portion,   and a plurality of projections for welding are formed on a lower surface of the closing body and the closing body is welded, through the projections, to a top board of the crown/member at a strength ranging from 0.5 to 3 kgf as expressed in terms of an overall tensile strength, the overall basal area of the plurality of the projections for welding ranging from 0.4 to 2 mm 2 .   
     
     
       8. The crown cap of claim 7 wherein the fixing means comprises projections protruded from an inner periphery of the crown/member. 
     
     
       9. The crown cap of claim 7 wherein the fixing means comprises an adhesive layer which lies between the rubber gasket and the top board of the crown/member. 
     
     
       10. The crown cap of claim 7 wherein the closing body, the crown/member, and the close-fastening ring are formed from a thermoplastic resin. 
     
     
       11. The crown cap of claim 7 wherein the closing body, the crown/member, and the close-fastening ring are formed from at least one resin selected from polycarbonates, polyethylene terephthalates, and polybutylene terephthalates.